Re: Lock-in amplifier VI to sideband
Eric, The hardware devices on the page you linked are much too slow for your signal at 840260 Hz. The maximum sampling rate for those devices is 102.4 kHz or 204.8 kHz, both of which are far below the...
View ArticleRe: long term discontinuous logging DAQ-assistant
I've looked at the examples but I don't understand how you can stop the logging with a digital signal - falling edge. Starting is easy but stopping is something very different. The only 2 options that...
View ArticleRe: executable missing menu
At some point controls using custom run-time menus stopped working for me. I forget which version of labview and it may have been 2009. These menus show up fine in development environment but then...
View ArticleRe: Non-invasive AC current sensor
You have mentioned AC and DC proportional to the AC signal. Exactly what are you trying to measure? RMS current? Average current? The current waveform? How fast will the signal you want to measure...
View ArticleRe: Mixed signal graph: Displaying digital busses
Yes, in all cases, the lines were dragged onto the bus. See Capture2.PNG and compare to Capture-NoDrag.PNG (enclosed), which I just created for comparison purposes - they are not the same. As far as I...
View ArticleRe : I want to control pneumatic valve using I/P convertor, so i need to...
The analog outputs of the USB-6009 are rated for 5 mA, maximum. So the fact that you got 18 mA is an indication of how conservatively NI rates their devices. You need an external circuit to drive a...
View ArticleRe: Mixed signal graph: Displaying digital busses
Yes. Capture 2 looks like Mike's screen shot. Capture-no drag does not. Capture 2 gives me the results like Mike's. Capture-no drag gives me results like you originally had. Do you see how capture 2...
View ArticleRe: I want to control pneumatic valve using I/P convertor, so i need to...
Lynnsorry if i sounded ranty in my last post but i get annoyed when people like us give sound advice and it seems to get ignored. look back and see how many times the question has been answered. we...
View ArticleRe: long term discontinuous logging DAQ-assistant
You should read the digital signal and analog signals continuously. Put the write to file in the true case of a case structure. Wire your digital signal to the case structure. When the signal is...
View ArticleRe: Mixed signal graph: Displaying digital busses
Yes, I hit OK. I can go back and reopen the properties for the Group Digital Signals VI and the dialog looks just like Capture2.PNG. Barry
View ArticleRe: Mixed signal graph: Displaying digital busses
Did you run the VI again? Give a screen shot that shows the dialog, the code, and the FP results after running all at once. I'm sorry, but what you are saying is happening is no longer correlating with...
View ArticleRe: Continuous multi-channel decimation
Hi Pat Is the number of channels known before this code is executed? If so, you could use a For loop to efficiently build an array out of the waveform constants and then use your code inside another...
View ArticleRe: time delay waveforms
The USB-6009 has a maximum aggregate sample rate of 48 kHz. That means that the sample rate per channel is 48000 divided by the number of channels. If you use all 8 channels, the maximum rate per...
View ArticleRe: Mixed signal graph: Displaying digital busses
I was thinking the same thing regarding the VI - see attached. I've tried this code on 2 separate PCs here with the same results. See what happens when you run it. Barry
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Re: How to communicate between an unknown hardware and labview using RS232
As Henirk said:Re engineering is hacking fun That alone might be an interesting student project. Lynn
View ArticleRe: motion object
What determines when the object accelerates? What determines the direction? Are X and Y independent or is the vector velocity limited to 30 cm/s? Is there a limit on how far the object may move? Lynn
View ArticleRe: Mixed signal graph: Displaying digital busses
Okay. I do see the behavior you have. I actually had LV12 and LV13 open on my PC at the same time. When I tried replicating the VI, it was in LV2013, and the differences were explained by the...
View ArticleRe: Calculating modulation index
Dylan, I do not see anything which looks like frequency modulation in the VI you posted. What information do you have and what are you trying to measure or analyze? Lynn
View ArticleRe: long term discontinuous logging DAQ-assistant
Remember that a stop button is just a boolean, same as a digital line. Look at the little example I attached. It's VERY basic to show you the concepts. I would add more timing control, a "quit"...
View ArticleRe: I want to control pneumatic valve using I/P convertor, so i need to...
Michael, Check some of the threads in the Breakpoint Forum. A few laughs can help. Sometimes it seems that the same advice is accepted when the second or third person proposes it, usually in slightly...
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